Resonance frequency analysis of implants placed in condensed bone

Area of Science:

• Dental Implantology
• Biomaterials Science
• Surgical Research

Background:

• Resonance frequency analysis (RFA) measures dental implant stability via the Implant Stability Quotient (ISQ).
• ISQ is presumed to correlate with insertion torque, a key indicator of primary implant stability.
• The reliability of RFA in condensed bone, a challenging surgical environment, requires further investigation.

Purpose of the Study:

• To evaluate the correlation between RFA (ISQ) and insertion torque in condensed versus untreated bone.
• To assess the influence of bone density (bone volume fraction) on implant stability measurements.
• To determine the feasibility of RFA for monitoring implant stability in different clinical scenarios.

Main Methods:

• Human cadaver study utilizing a split-mouth design.
• Implants were placed in edentulous jaws and fresh extraction sockets with or without bone condensation.
• Measurements included ISQ, peak insertion torque, and bone volume fraction (BV/TV) pre- and post-surgery.

Main Results:

• In edentulous jaws, ISQ and insertion torque showed strong correlations in both untreated (r=0.63) and condensed bone (r=0.82).
• In fresh extraction sockets, the correlation was significant in untreated bone (r=0.78) but absent in condensed bone (r=0.15).
• Preoperative bone volume fraction predicted insertion torque and ISQ in edentulous jaws, but not in extraction sockets.

Conclusions:

• RFA is a reliable method for assessing implant stability after late placement in condensed bone.
• RFA is not reliable for monitoring implant stability immediately after placement in condensed fresh extraction sites.
• Bone density significantly influences the relationship between RFA and insertion torque, particularly in immediate placement scenarios.